A film so good that, for most of its run time I forgot it had a gimmick. Its an incredibly effective example of the gimmick in question, but that's really the least if it.
From a very basic plot that allows experimentation to run free, there are so many competing avenues and elements that it is designed to obfuscate. Technically it is perfect. The performances are wild and over the topic but I don't think it would have worked had…